Fluid dispenser member

Abstract

A fluid dispenser member designed to be associated with a fluid reservoir (50) and comprising:

• • a chamber (1) in which the fluid is put under pressure, the chamber being provided with an inlet valve (161, 38) and with an outlet;
  • a dispensing orifice (25);
  • a main piston (133) in leaktight sliding contact inside a main cylinder (242) for the purpose of causing the volume of the chamber to vary;
  • a pusher (20) that can be actuated to generate relative movement between the main piston and the main cylinder; and
  • a differential piston (31, 32, 33) in leaktight sliding contact inside the pusher for the purpose of selectively unmasking the outlet of the chamber;
  • said dispenser member being characterized in that it further comprises stroke-limiting means (28, 39) for limiting the stroke of the differential piston in the pusher, said stroke-limiting means being provided between the pusher and the differential piston.

Description

CROSS REFERENCE TO RELATED APPLICATION [0007] This application claims the benefit under 35 U.S.C. §119(e) of pending U.S. provisional patent application Ser. No. 60 / 561,511, filed Apr. 13, 2004, and priority under 35 U.S.C. §119(a)-(d) of French patent application No. FR-03.15192, filed Dec. 22, 2003.TECHNICAL FIELD [0008] The present invention relates to a fluid dispenser member that is generally designed to be associated with a fluid reservoir so as to constitute therewith a fluid dispenser. It is a dispenser member that is generally actuated manually by means of a user's finger. The fluid is dispensed in the form of a sprayed stream of fine droplets, a continuous trickle, or a dollop of fluid, in particular for viscous fluids, such as cosmetic creams. Such a fluid dispenser member can, in particular, be used in the fields of perfumes, cosmetics, or indeed pharmaceuticals, for dispensing fluids of various viscosities. [0009] The present invention relates more particularly but not ...

AI Technical Summary

Benefits of technology

[0014] To achieve this object, the present invention proposes a fluid dispenser member designed to be associated with a fluid reservoir and comprising: a chamber in which the fluid is put under pressure, the chamber being provided with an inlet valve and with an outlet; a dispensing orifice; a main piston in leaktight sliding contact inside a main cylinder for the purpose of causing the volume of the chamber to vary; a pusher that can be actuated to generate relative movement between the main piston and the main cylinder; and a differential piston in leaktight sliding contact inside the pusher for the purpose of selectively unmasking the outlet of the chamber; said dispenser member being characterized in that it further comprises stroke-limiting means for limiting the stroke of the differential piston in the pusher, said stroke-limiting means being provided between the pusher and the differential piston. Thus, the differential piston is connected to the pusher in such a manner that its displacement is solely dependent on its interaction with the pusher, and no longer with the body. In this way, the pusher and the differential piston together constitute an independent entity which can be mounted on the body in a single operation. In the above-mentioned prior-art document, the differential piston does not really dependent on the pusher or on the body, so assembling the pump is relatively complicated. With a differential piston contained within the pusher, assembling the dispenser member is much simpler.

Problems solved by technology

In the above-mentioned prior-art document, the differential piston does not really dependent on the pusher or on the body, so assembling the pump is relatively complicated.

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